just for info/info .. , The needle becomes part of the idle circuit when the Needle Jet is worn and allows fuel to enter the system via the ovaled out Needle Jet orifice , which then accounts for the idle going up/down due to the fuel getting by what would otherwise be a "metered" circuit , it now becomes a randomly open circuit , hence the idle inconsistency and why sometimes its high and sometimes its idling normally ..... , not saying this is always the case , just saying it does happen when the Needle Jet is compromised and worn , which allows fuel to bypass intermittently when the throttle is closed , when the throttle is open , then the wear has no effect on the metering of the fuel circuit ...make sense ??Just for info. - The needle is not part of the starting or idle circuit. It only comes into effect as you open the throttle through approx. mid throttle. That is the taper designed into it giving you the linear fueling.
I have a flow / change chart started. And will update once I can get to it the fixes. Thank you all..The trouble for Metal_jd is both Jim and Neil are both right, though have identified different causes.
Metal_jd just work your way through the suggestions till you find the cause.
You will find a lot of knowledge and experience on the forum and we all like to put forward our 2 cents worth to solve the problem.
It must be about time a flow chart was done to work through different issues.
Yes I know every case is different but between us all there must be a checklist of things to do from the simple (disconnect the TPS) to the difficult/ cost money fixes. It would make an excellent sticky for sure.
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